Liquid filters



Unilifi States Patent LIQUID FILTERS Alex Pudlo, New Holstein, Wis., assignor to Pudlo Liquid Filter, Inc., New Holstein, Wis., a corporation of Wisconsin Application August 23, 1954, Serial No. 451,419

1 Claim. (Cl. 210-443) This invention relates to improvements in liquid filters.

It is a general object of the present invention to provide a simple and relatively inexpensive filter construction which can be easily connected in a conduit, and which is adapted to remove foreign matter such as rust, sand, lime, or mineral scale from water or other liquid flowing through the conduit, the unit being of a type which is adapted to receive a filter pad, and the construction being such that the pad may be easily replaced when required.

A further object of the invention is to provide a filter construction wherein there are partitions or baflles so arranged as to prevent short circuiting of the liquid, thereby insuring a substantially equal distribution of the filtering action throughout the face of said pad so that all portions of the pad are made use of in removing foreign matter.

A further object of the invention is to provide a liquid filter wherein the pad is supported against deflection as a result of liquid pressure at a number of spaced locations. Thus premature breakage of the pad is prevented.

A further object of the invention is to provide a filter construction which is so Worked out that the liquid must pass through the pad twice, once from one side of the pad through a limited area at the center, and once from the opposite side through substantially all of the rest of the pad which surrounds said central area.

Other objects of the invention are to provide a liquid filter which can be easily taken apart for cleaning, which is compact, and which is otherwise well adapted for the purpose described.

With the above and other objects in view, the invention consists of the improved liquid filter and all of its parts and combinations, as set forth in the claims, and all equivalents thereof.

In the accompanying drawing, illustrating one complete embodiment of the preferred form of the invention, in which the same reference numerals designate the same parts in all of the views:

Fig. 1 is a plan view looking at the interior of one section of the filter;

Fig. 2 is a plan view looking at the interior of the other section of the filter; and

Fig. 3 is a transverse sectional view through the assembled filter.

Referring more particularly to the drawing, the filter comprises two sections, preferably made of suitable metal, the section being designated for convenience of description as the top section, and the section 11 as the bottom section. It is, however to be understood that the unit may be installed with either side up, or it may be installed at an angle to the position illustrated. The top section 10, which is illustrated alone in Fig. 2 includes a disc 12 having a depending annular rim 13. Spaced inwardly of the rim 13 and concentric therewith is a circular partition 14. Concentrically located within the circular partition 14 is a smaller circular partition 15 which forms the wall of a central axially extending duct 17. The upper portion of the filter section 10 is of relatively thick, solid metal. Extending radially therein is an inlet bore 16 which communicates with the central duct 17. Another radial bore in the upper solid portion of the filter forms an outlet duct 18. The under side of the outlet duct communicates with the circular chamber 19, which is formed between the circular partitions 14 and 15, and also communicates with a circular chamber 20, which is formed between the rim 13 and partition 14.

The bottom section 11 of the filter includes a disc 21 having a circular rim 22. Spaced inwardly of the circular rim 22 and projecting upwardly from the disc 21 are arcuate baffles 23 arranged in circular formation, with the ends of the individual arcuate bafiies spaced apart to form four gaps or radial outlets 24 for liquid. Within the circle of baffles 23 is a relatively small circle formed of arcuate baffies 25. The individual bafl'les 25 are spaced apart at their ends to provide gaps or radial liquid outlets 26 through which liquid may flow from the small central chamber 27 into the annular chamber 28. The gaps 24 provide for communication between the annular chamber 28 and the outermost annular chamber 29.

The upper section 10 has laterally projecting ears 30 provided with bolt holes 31. The bottom section has ears 32 which are adapted to register with the ears 31 in assembly. The ears 32 have bolt holes 33.

In assembled position, a filter pad 34 is clamped between the two sections as shown in Fig. 3. The clamping action is obtained by tightening the nuts 35 on the ends of bolts 36, the latter passing through the bolt holes 31 and 33.

The filter pad may be made of paper, cloth, or other suitable fibrous material. When in position, it is to be noted that the pad 34 is clamped near its periphery between the rim portions 13 and 22. It is also clamped inwardly of its periphery between the circular partition 14 and the arcuate baffles 23. In addition, it is clamped between the small circular partition 15 and the arcuate baffies 25. As a result of this arrangement, the filter pad is supported along spaced, concentric circular lines. Thus there is no large unsupported span which might flex unduly under the liquid pressure and cause rupturing of the filter pad.

In use, liquid such as water will first enter the radial duct 16 and then flow in an axial direction in the duct 17, through a limited area at the center of the filter pad from one side thereof and into the central chamber 27 of the section 11. From the central chamber 27 the liquid will fioW radially out of the four gaps 26 into the annular chamber 28. Some of the liquid in the chamber 28 will pass through the filter pad 34 into the chamber 19 of the section 10 and will then travel out of the outlet 18. Other liquid from the chamber 28 will pass radially through the gaps 24 into the outer annular chamber 29 of the section 11. From this chamber it will then pass through the filter pad 34 into the outer annular chamber 20 of the section 10 and then out of the outlet 13. It is to be understood that a pipe line (not shown), carrying the liquid to be filtered, is screwed into the tapped end portion 37 of the inlet duct 16 and that an outlet line for the liquid which has been filtered will be screwed into the tapped opening 38 of the outlet duct 13. The improved filter is particularly useful in a water line but is, of course, suitable for use in a conduit for any desired liquid.

When it becomes necessary to replace the filter pad 34, the nuts 35 may be removed and the section 11 slipped off. A new pad can then be easily substituted without removing the filter unit from the liquid line. When the section 11 is removed, it can be easily cleaned, and it is to be noted that all of its chambers are readily accessible for such cleaning.

Various changes and modifications may be made without departing from the spirit of the invention, and all of such changes are contemplate-d as may come within the scope of the claim.

What 'I claim is:

A filter comprising a first cup-shaped section having a projecting rim, a second cup-shaped section having 'arim projecting toward'the rim of the first section, a' filter pad clamped between said rims, said first section having a central axial duct the discharge end of which is in contact with a filtering face of the filter pad "on-a first side of said pad, and said section having a liquid inlet leading to said central duct, said first section also having a liquid outlet duct and having a partition spaced from and surrounding said central duct and forming a plurality of chambers therearound, all of which are out of communication with the. liquid inlet and central duct, and all of which afford communication between 'said outlet duct and face portions 'of' the filter pad which surround said central duct on said first side of the filter ,pad, said partition having a height equal to the height of the central axial duct, first baflle means in the second cup-shaped section forming a central chamber on the opposite side of said filter pad and positioned to receive liquid which has passed through the filter pad from said central duct 0f the first section, a second bafiie vmeans in said second section also on said opposite side of the filter pad for directing liquid into all of the surrounding chambers of the first section through substantially all of said face portions of the pad which surround the central duct with the liquid directed through the filter pad in a direction which is the reverse of its previous direction when it passed through the central axial duct,tsaid first and second baffie means in the second cup-shaped section providing chambers in said second section which communicate with one another, and said bafiie means being of a height to contact the opposite side of the filter pad from that contacted by the end of the axial duct of the first cup-shaped section.

References Cited in the file of this patent UNlTED STATES PATENTS 729,693 Steinkoenig a June 2, 1903 1,475,577 Green Nov. 27, 1923 1,488,671 vHale Apr. 1, 1924 1,966,274 Wells July 10, 1934 

